Grinding-mill



(No Model.)

' s. 0. SOHOFIELD.

GRINDING MILL. No. 283,518. Patented Aug. 21, 1883.

N. ruins. mo'www w. Via-Mn, 0.0.

UNITED STATES PATENT OFFiCE.

SILAS c. SOHOFIELZD, or nnnnronr, ILLINOIS.

GRINDING-MILL.

SPECIFICATION forming, part of Letters Patent No. 283,518, dated August 21, 1883.

' Application filed May 5, 1883. (No model.)

To all whom it may concern.-

Be itlmown that I, SILAS C. Sonorinnn, a resident of Freeport, in the county of Stephenson and State of Illinois, have invented certain new and useful Improvements in Grinding- Mills; and I do hereby declare the following to be a full, clear, and. exact description the invention, such as will enable others skilled in V the art to which it pertainsto make and use the same.

My invention is unimproved sweep-actuated cone-and-she1l mill of the class adapted to grind ear-corn. Its detailsare fully described and eX- 5 able meal-box; Fig. 2, a bottom view of the rotating breaker F; Fig. 3, a central vertical section of the entire mill through line I V, Figs. 1 and 2, the movable parts of the mill having been rotated forty-five degrees from the position shown in Figs. 1 and 2 until the line I V, Fig. 2, coincides with the same line in Fig.1; Fig. 4, a plan of the rotating coneH; and Fig. 5, a top View of ahorizontal section of the mill, the plane of section passing through the line as y, Fig. 3. i

In these views, A is an ordinarymeal'box, to which is rigidly bolted a frame consisting of three radial arms, 0, supporting a ring, S, formed integrally with them. liithin the ring S and formed integrally with it are three radial arms, G, which lie in the same verticalplanes as the outer arms, G, and are provided with coarse breaking-teeth, a, on their upper faces,

and with smaller breaking-teeth, a, on their lower faces. A hollow cylinder, T, is formed integrally with the arms G at their inner ends, and serves as a bearing for the shaft of the movable part of the mill, as hereinafter stated.

To the inner faces of the armsG, immediately below the ring S, is rigidly fastened a grindingring, B, provided with outer ears, Q, which are secured by bolts to the arms 0. The ring S and grinding-ring B are continuous, and form the stationary shell of the mill.

In the upper edge of the riugSis anannular groove, and in this groove rotates freely the convex lower edge of a movable ring, I),which is formed integrally with four radial breaking-arms, F, provided with coarse breakingsupports the cone H, as hereinafter set forth.

On the lower face of the plate M is formed, integrally with it, a hollow cylindrical shaft, N, which is journaled in the hollow cylinder T,

- already mentioned, and is of about the same vertical length as said cylinder. Two sectorshaped lugs, O 0, project downward below the lower face of the cylindrical shaft N and enter a suitable opening in the apex of the cone H, which hangs below. The cone is composed of two parts, of different inclination, the upper part being parallel to the breaking-arms G and the lower part to the grinding-ringB. The up per part is provided with small breaking-teeth, a, so arranged as to pass between the teeth a. on the lower faces of the arms G,while the lower part, B, of the cone is provided with grinding ridges, which act in conjunction with the ridges on the ring B. At the apex of the cone is an opening composed of two opposite sectors, O

O,wh'osepoints meet in asmall central circular opening, 0. The sector-shaped lugs O O of the cylindrical shaft N enter the sector-shaped openings 0 O,while abolt, K, passes upward through the central opening, 0, of the cone and through they central opening in the plate M. This bolt is screw-threaded at the upper end and provided with ahand-wheel, L, by means -of which the cone may be raised or lowered.

The lugs O O, in connection with the openings 0 0, form a clutch, by means of which any rotary motion of the breakingarms Fis communicated to the cone H, and the bolt K forinsa support for the cone, and at the same time permits sufficient rocking motion of thecone for adjustment to the inner surface of the shell.

Theoperation of the mill is evident. Earcorn being placed in the hopper, power is applied to the sweeps and rotates the breakingarms F. By means of the clutch described the cone His rotated also. The cars are broken between the coarse breakingteeth above the stationary arms G, fall on the upper surface of the cone H, and are further crushed between the ICQ finer breaking-teeth a a, and finally pass downward and are ground between the grinding surfaces of the rings B It. The fineness of the meal is regulated by raising or lowering the cone by means of the bolt K and hand-wheel L.

The mill, as shown, may be used for a shelledgrain mill; but in theconstruction of a mill especially for grinding shelled grain thebreaking-teeth may be dispensed with and the cone hung from a plain plate above the stationary shell.

I am aware that it is not new to combine in a grinding-mill a stationary shell, a sweepcarrying device rotating above said shell, and a cone suspended within the shell by means adapted to impart to it the rotary motion of the sweep-carrying device; and I am also aware that it is old to construct a mill. having a stationary shell whose crown or upper portion is provided with breaking-teeth on its upper and lower faces, a rotating breaker above said shell and provided with breaking-teeth on its lower face, and a rotating cone provided with break. ing-teeth on its upper face. I do not therefore expect to claim or cover either of these constructions as my invention. The mill shown and described in this application, however, combines both these features or forms of construction, and is by reason of such combination greatly simplified and cheapened, and at the same time its effectiveness is greatly increased as compared with any mill of its class with which I am acquainted.

I Having now described my invention and explained its operation,what I claim as new, and desire to secure by Letters Patent, is

The improved grinding-mill shown and described, consisting of thefollowing parts: the stationary shell S, provided with breakingteeth a a on its upper and lower faces, respectively, and with a suitable grinding-ring, B, attachedto its inner surface, the breaker F, rotating above said shell and provided with breaking-teeth a on its lower face, the cone H, suspended within the shell and from the breaker by means of a bolt, -K, coincident with the axis of the mill, the nut L, engaging with said bolt and adapted to raise and lower the cone, and the downwardly-projecting central portion, 0, of

the breaker F, engaging with the cone and im- U parting to it the rotary motion of the breaker, substantially as shown and described, and for the purpose set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

SILAS O. SCIIOFIELD.

Vitnes'ses:

It. H. \VILEs, OSCAR TAYLOR. 

